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The SafeSearchURLChecker didn't depend on //chrome. Move it to a new
safe_search_api component.

We will reuse safe_search_api::URLChecker in a later CL for filtering
URLs based on the SafeSearch API (a generalization of
SupervisedUserURLFilter).

Because we're creating a namespace, we can drop the SafeSearch prefix
and move the Classification enum out of the URLChecker class. Also clean
up presubmit issues in changed lines.

Bug: 819405
Change-Id: Iaf411b1232eb937f93056d8e3553435fb7779bee
Reviewed-on: https://chromium-review.googlesource.com/1081892Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565486}